Enhanced current flow through meandering and tilted grain boundaries in YBCO films

Details Enhanced current flow through meandering and tilted grain boundaries in YBCO films Enhanced current flow through meandering and tilted grain boundaries in YBCO films

2007-01-03

arxiv.org/abs/cond-mat/0701047v1

Applied Physics Letters 90, 212501 (2007)

Physics

Condensed Matter

Superconductivity

3 pages, 3 figures. For submission to Applied Physics Letters. Movies and higher resolution figures at http://www.stanford.edu

Scientific paper

10.1063/1.2740610

Grain boundaries (GBs) have been shown to limit critical current density, Jc, in YBa2Cu3O7 (YBCO) coated conductors. Here we use transport measurements and scanning Hall probe microscopy coupled with current reconstruction to demonstrate that GB geometry, such as the in-plane meandering observed in films grown by metalorganic deposition (MOD) on rolling assisted biaxially textured substrate (RABiTS), can lead to higher GB Jc. We observe current-induced flux entry into such a coated conductor, then model its behavior by imaging films with single, straight GBs tilted at various angles to the applied current.

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